Davis Instruments Fiberglass & General Purpose Cleaners
Davis Instruments FSR: Marine-Grade Fiberglass Cleaning, Simplified
Davis Instruments has been a trusted name among boaters and marine enthusiasts for decades, and their approach to fiberglass care is a perfect reflection of the brand's no-nonsense, results-driven philosophy. Within the Fiberglass & General Purpose Cleaners category, Davis offers their flagship FSR (Fiberglass Stain Remover) line — a product that has earned a devoted following on docks and trailers across the country.
What Makes Davis FSR Different?
FSR is a unique stain-absorbing gel formulated to remove oil, rust, exhaust, waterline, and transom stains from fiberglass surfaces. What sets it apart from conventional hull cleaners is its chemistry-first approach: the unique gel formula chemically removes stains with no rubbing required. That means no compounding, no abrasive scrubbing, and no risk of scratching your gelcoat or painted surfaces.
FSR is non-abrasive and safe for white painted surfaces and gelcoat — a critical distinction for boat owners who want a thorough clean without compromising the finish they've worked hard to protect. It also removes rust from stainless steel stanchions and railings, tackles "rust bleeders" from the hull or deck, and lifts rust stains from clothing, sail cloth, and other fabrics.
Two Sizes for Every Job
Davis offers FSR in two formats to match the scale of your cleaning needs. The standard FSR (SKU 790) is a 16-oz bottle ideal for routine maintenance and spot-treating problem areas. For serious seasonal cleanups or larger vessels, the FSR Big Job (SKU 792) delivers the same trusted formula in a larger 2-liter size, giving you more product to tackle extensive waterline buildup, transom discoloration, and road grime from trailering.
Versatile Beyond the Waterline
FSR isn't limited to boats alone — it works wherever fiberglass stains appear, including shower stalls and furniture, and is equally effective at removing road soil from trailered boats and recreational vehicles. This versatility makes it a genuinely useful product to keep in your boat bag, garage, or maintenance kit year-round.
Simple Application Process
Using Davis FSR requires no special equipment or expertise. Simply apply with a brush, sponge, or cloth, wait a few minutes, then wipe off or rinse. For especially stubborn or set-in stains, multiple applications over time yield the best results. The gel consistency keeps the formula in contact with the stain rather than running off, which is especially valuable on vertical hull surfaces and transoms where liquid cleaners tend to drip away before they can work.
A Brand Built for the Marine Environment
Davis Instruments started its life in the 1960s as a marine product company specializing in lightweight plastic navigational sextants , and that marine DNA runs through every product they make. Davis offers a line of marine and boating accessories enjoyed by sailors, power boaters, and anglers around the world. The FSR line reflects that heritage: it's a practical, effective solution developed with the real-world challenges of boat ownership in mind — from muddy ramp launches to months of waterline exposure.
Whether you're prepping for a spring launch, freshening up your hull mid-season, or cleaning off the grime after a long haul on the trailer, Davis Instruments FSR brings the kind of straightforward, proven performance that keeps boats looking their best.