Checkout the awesome power of Grunt! fibreglass cleaner

Grunt fibreglass boat cleaner 1L and 500ml Product bottles
Before cleaning fibreglass with Grunt After cleaning fibreglass with Grunt

Grunt! boat cleaner has revolutionised boat cleaning and removing stains. It has made a difficult boat cleaning task easy. Made in the UK but sold worldwide, it is now available in the USA.

Cleaner Boats superior cleaning products for fibreglass and stainless steel - Made in the UK Crop Logo

Find Your nearest Store Selling Grunt!

It is the ONLY boat cleaner that can effortlessly remove stubborn stains. If you have any of the following issues on your boat, you need Grunt! boat cleaner.

Yellow/Brown waterline marks

Rust stains around stainless fittings

Exhaust stains

Bird mess


Mold and mildew spots

Grunt! boat cleaner is not new. Boat owners worldwide have been using this magical cleaner for years. Seeing is believing. We have many examples of before and after images sent in from our happy customers.

See the amazing power of Grunt! boat cleaner through our before and after image wall.

Take a look at how easy it is to use Grunt! fibreglass boat cleaner through our action video gallery.

We often get asked the same questions. Check out a few of them here to see if yours has been asked before


We came across Grunt! boat cleaner purely by accident and arranged to meet Chris, the owner of the company, at Southampton Boat Show. We took some products and had them independently tested and were so impressed with the results we requested the UK distributorship.

Mark French

MD Promain Paints And Coatings UK Ltd

Hi Chris & happy new year
The lads used the Grunt product today and were very impressed please could you send the trade price list and sizes you sell them in
Kind regards


The Marine Group, Cardiff & Swansea

Oh my goodness what an amazing product that really does work! My boat grp was left stood untouched for 3 years before I bought her, I’ve tried everything to clean her up, nothing worked. Stumbled over this product and thought let’s try it. So glad I did it’s amazing my boat is well on her way to shining like a new vessel super pleased and just ordered my next batch! Thank you grunt.

Donna Hardingham


Brush on, leave for a few minutes and wash off – it is so easy to use and the results are immediate. For a busy charter boat it’s brilliant as it keeps the boat looking good with no down time!

Nic Parton

Bluetooth RIB Charter

Last year I used your product Grunt! boat cleaner on our 23 ft bayliner in Baltimore. She was in a poor state after just purchasing her. I couldn’t speak highly enough your product. Coming from a marine background and heavily involved in boat maintenance it amazed me the ease of application and the little effort on using it. I have recommended it to anyone in the industry I know.
Thank you, a sold user.

Cathal Cottrell

Cailin Oir cape clear island ferry company

It’s not often that we take on a new cleaning product and it takes off from day one

Neil Paramor

Purchasing Director Force 4 Chandlery

My 14 year old fishing boat had a distinct yellow faded look to it. It was recommended by Promain Paints that I use your product Grunt. I was amazed at the result, the yellow became white, the rust and gunge around the fittings disappeared. It was so easy and economical to apply. I thoroughly recommend this product. Just ensure you allow enough time for it to work.

Mick Siggery

Selsey, West Sussex

A steel boat next to me was using an angle grinder and ruined my deck with steel chippings causing rust to leach into
the pores of the gelcoat – I thought my boat was ruined.

Thanks to Grunt! boat cleaner the stains were easily removed with little effort and no damage to my deck, a truly first class product and simple and economical to use!!

Donal McBride

Lough Swilly Marina, Donegal

Hi Chris, I regularly leave my Redbay 6.1 RIB in Warrenpoint harbour for up to a month at a time with no antifoul. She always looks dark brown underneath when she comes out but a quick go with your Grunt! boat cleaner has the white hull looking like new again – a superb product.

Connla Conway

Conways Garage, Warrenpoint, NI

The Boat in the demo video was in our yard at the time of filming – the results are truly outstanding as you can plainly see with little or no effort – needless to say we use and sell Grunt! boat cleaner in our boatyard and chandlery and can recommend it to any one.

Michael Kehoe

New Ross Boat Yard. Co Wexford

Just to let you know I gave you products ie: Boat Buddy & Grunt! boat cleaner to a friend of mine to use on his boat which he keeps moored all year round plus he lives on it when he is in Fermanagh . The boat in question has not been out of the water in 2 years so it was pretty dirty so it needed to be cleaned. He did use your products which I gave him and I have to say, he was very impressed with the results and so was I and my friends, so we will be using Boat Buddy & Grunt! boat cleaner from now on.

Peter Kelley


Just used your Grunt! boat cleaner on my paintwork it removed stains I’ve been trying to move for months in seconds, unbelievable, 10 out of 10, I’m converted.


Trevor Forman

CEO River Canal Rescue

Just used GRUNT on a wide beam canal boat we were cleaning for a customer. I honestly could not believe the results, and so easy! No hard rubbing and scrubbing, just a gentle wipe over and the grim of a few years just disappeared. Definitely recommended!

Tony Watson

Fastnet Marine, Yorkshire, UK

Funny name – serious product – easy to use – unbelievable results -”we guarantee it!”

Maurice O Reilly

Irish Distributor For Grunt!

I applied Grunt boat cleaner to the hull of my Sadler sailing yacht before embarking on a 2,200 mile Round Britain trip last year, only to find that the hull was looking just as good on completion of the 4-month voyage, as when I had started out!
The product is really good in producing an excellent overall result on GRP surfaces.
I am now just about to re-order as the boat is coming out of the water soon.

Nigel Stokes

Deal, Kent

This is the only product we now use to keep our fleet of boats clean – it is the only one that works in our area.

Eddie English


Best cleaner I’ve tried by far, took away all the yellowing from the gel coat and has left the boat looking like new. Once applied, leave on for half an hour/45 mins then wash off, simple as.



Having tried this product I can say it is totally awesome

James Luke

Chief Engineer on MY Angara


Got incredible results with GRUNT! – honestly, it’s the best product I have ever used, quite incredible.

I’ll order another couple of litres to have for the season now.

Many Thanks,



Dublin, Ireland

Hello: have tried your product, and must say that it was fantastic, as I work a lot with boats I wonder if you have anybody that sell your product in Trøndelag, or is it only available on the web.

P.S. Will recommend to others

Rune Maaoe



Checkout the awesome power of Grunt fibreglass cleaner

How to clean your gelcoat

By Chris Gibbons | 4 June 2019

How to clean your gelcoat Gelcoat exterior surfaces on your boat need cleaning periodically to remove salt deposits dirt build up and yellow/brown waterline staining which happens throughout the season. This is important to keep gelcoat clean and in good condition. Salt is hygroscopic and will absorb moisture from the air keeping your boat damp…

How to clean your sails.

By Chris Gibbons | 11 September 2018

Sails need cleaning periodically to remove salt deposits and dirt build up over the season. This is important to keep sails clean and in good condition and maximize their useful lifespan. Salt is hygroscopic and will absorb moisture from the air. If it is not removed from sails the surface will remain damp and mildew…

New Year – New Stockists

By Chris Gibbons | 7 September 2018

All Boat Buddy, Grunt! boat cleaner and Super Stainless now available through Quigleys Marina and Lakeside Marina both located near Athlone on the beautiful river Shannon in Ireland. See our “Stockist” pages for full details. Welcome aboard guys.

What regulations, if any, does Grunt! Boat Cleaner meet?

By Chris Gibbons | 7 January 2014

10. What regulations, if any, does Grunt! Boat Cleaner meet? Grunt! Boat cleaner meets or exceeds all the current regulations worldwide. Grunt! boat cleaner is manufactured under ISO 9001 ensuring full quality control, it meets the criteria laid down in (EC) No. 648/2004 on detergents, it also complies with the latest “Global Harmonisation System” regulation on…

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