Does soft washing smell?

Of the documents behind this page, only the bleach maker's safety data sheets write an odor down. The Clorox Company's 2019 safety data sheet for Clorox Disinfecting Bleach2 lists the product's physical state as liquid and its odor as bleach, a plain entry on a technical form rather than a marketing line. No roofing association or maker read for this page publishes an odor of its own; the bleach maker's own sheet is the source.

The Clorox Company's 2021 sheet for Clorox Disinfecting Bleach (document US001229) lists that product's odor as lemon. That is why the bleach odor entry is printed here as the 2019 sheet's description of Clorox Disinfecting Bleach2, not as a general statement about every bottle of bleach.

ARMA's shingle bulletin describes the solution used against algae discoloration as liquid household bleach (sodium hypochlorite) and water, the same kind of product that sheet was written for. A second ARMA bulletin gives its own ratio for shingle work, a 50:50 mix of laundry strength liquid chlorine bleach and water, while ARMA's first bulletin notes that mixing directions may vary among shingle manufacturers. Whatever the ratio, the ingredient is liquid household bleach, and a bleach odor is what one maker's sheet records for its own.

That is a shingle figure, printed as ARMA's own, and it does not travel to tile or metal. What is actually in a given solution, ratio included, is answered in full at what is in a soft wash solution rather than repeated here.

The Metal Roofing Alliance's recipe names no bleach at all: a garden hose first, and if that is not enough, a quarter cup of mild detergent per gallon of water, whether mild laundry detergent, car washing soap or dish soap. No document read for this page writes down an odor for that mix.

Eagle recommends water alone for concrete tile, with a cleaner added only when the roof needs it and only in the most diluted solution possible, compatible with concrete. Each roofing body publishes its own chemistry for its own material and none of them transfers, which is why the honest answer to a smell question starts with which roof, and which recipe, before it goes any further. How each maker's method compares is laid out by roof type at the roof cleaning page's surface by surface section.

No document read for this page states how long an odor lasts once the rinse is done, on any material, so this page states none. What it can say is the mechanism: a smell follows what is in the solution, not a separate published fact of its own. What the bleach maker's sheet says about vapors and ventilation, and whether to be home while a roof is washed, is set out at staying home during roof cleaning.

A related smell question belongs to a different surface entirely: does paver sealing smell covers a sealer rather than a roof solution. The roof method itself is defined at soft washing, and what exterior cleaning covers as a whole is set out at what is exterior cleaning.