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Posts: 47
| Muriatic acid will remove the scum line, no matter how long the boat sat in the water. May need two applications for heavy / thick scum line. Best used on a day with a nice breeze and using a mask is not a bad idea either. Also use thick rubber gloves, if you get some on your skin spray with water. I used to take a milk jug and cut the top off, leaving the handle on. Pour some mauritic acid in the jug and use a 4 inch disposable paint brush. Work in small 3-4 foot sections. Dip the paint brush in the acid and paint it on the scum line / small section. The scum will bubble up. Wait 20-30 seconds and spray it off with the hose. The hull will look like new when your done.
I never had a problem with an aluminum hull or the transducers, but be careful around anything plastic.
Post the before and after pictures.
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