Setting up a foam lance: nozzle, dosing and dwell time
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Koch-Chemie
Hull Precleaner alkaline "Hal" Alkaline Pre-Cleaner (Marine Line)
Effective pre-cleaner for boat hull and boat deck

Koch-Chemie for boats and yachts, complete.
Koch-Chemie
Hull Precleaner acid "Hac" Acidic Pre-Cleaner (Marine Line)
Acid-based pre-cleaner for boat hulls and decks
Too much choice in Marine Line Pre-Cleaner from Koch-Chemie? Get help picking: