Count the bottles before the cleaner runs out mid-job
Running dry halfway through a mold clean-up usually means starting the whole surface again. Enter the affected area, the amount you apply per square foot, how many passes you intend to make and the size of one bottle, and the page returns the total quantity, the bottles to buy and how much is left over once that count is rounded up. Planning two passes simply means entering 2.
How the numbers are worked out
Area multiplied by coverage gives one pass, and that is multiplied by the number of passes for the total. The bottle count divides the total by one bottle and rounds up once at the very end, so nothing is inflated by rounding at intermediate steps. No officially recommended coverage is offered here: a trigger spray and a cling gel use wildly different amounts, and the figures in circulation are not a standard. As of October 2026, use the usage figure printed on your own product.
Product types, concentrations, dilution ratios and ventilation times are not covered on this page. For directions and precautions, follow the product label and the manufacturer's instructions.
Frequently Asked Questions
No officially recommended coverage is offered here, because a trigger spray and a thick gel behave nothing alike. Use the usage figure on the back of your product if it has one, or spray a small measured patch and divide what you used by its area.
Bottles are not sold in halves, so the figure is rounded up to make sure you do not run short. The extra that rounding buys you appears on its own line as the amount left over, which is the number to watch if you are trying not to over-buy.
This page works from the quantity actually applied and offers no dilution ratio. If you dilute, enter the coverage per square foot measured on the diluted liquid rather than the concentrate.