This is $8 at Home Depot. Why so much more here?

I agree with the original question and still don't get it... they said $8 x 2 = $16 at Home Depot which is still a LOT cheaper than $49.99 in Amazon. To be honest I saw it at The Home Depot for $12.28 and it is still cheaper. https://www.homedepot.com/p/30-Seconds-64-oz-Outdoor-Multi-Surface-RTS-Cleaner-100537422/308469802

Is it safe to use on a painted surface like aluminum siding on mobile homes

I used it on my gutters and bricks. It did fine on both. I'm not sure about aluminum siding or motor homes, but it does great on brick and gutters!

Does 30 second cleaner clean fiberglass boat hulls?

Cleans stains from algae, mold and mildew , plastic outdoor furniture, vinyl siding, fiberglass spa. Works great.

30 SECONDS Outdoor Cleaner is made to be safe on most all outdoor surfaces. We do always recommend testing in a small, inconspicuous area first. Spray a small amount of cleaner, let sit 5 minutes, and rinse to see results. There are some surfaces that require extra caution. The Outdoor Cleaner should not be used on untreated metals such as chrome or anywhere in the engine. Do not let 30 SECONDS Outdoor Cleaner dry on glass. It will not etch the windows, but will leave a residue behind. 30 SECONDS Outdoor Cleaner will discolor the carpet in the vehicle, do not allow it to come in contact with interior surfaces.

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✨ Transform your outdoor space in 30 seconds—clean smarter, not harder! 🌿

VERSATILE SURFACE POWERHOUSE - Perfect for wood decks, concrete, asphalt, brick, vinyl siding, and more—one cleaner to rule them all.
LIGHTNING FAST OUTDOOR CLEANING - Blast away algae, mold, and moss in just 30 seconds—no pressure washer needed.
MAXIMUM COVERAGE MAXIMUM VALUE - One gallon cleans up to 550 sq ft on non-porous surfaces—get more done with less product.
ECO FRIENDLY PLANT SAFE FORMULA - Gentle on your lawn, trees, and shrubs when used as directed—beautify without compromise.
EFFORTLESS HOSE END SPRAY APPLICATION - Simply attach, spray, and rinse—cleaning made so easy you’ll wonder why you waited.

The 30秒屋外クリーナーホースエンドスプレー is a fast-acting, eco-friendly outdoor cleaner that removes algae, mold, and moss in just 30 seconds. Safe for lawns and plants, it works effectively on multiple surfaces including wood, concrete, brick, and vinyl siding. Each gallon covers up to 550 square feet on non-porous surfaces, and the convenient hose-end spray design makes application effortless—no pressure washer required.