Spray & Forget - JSF2 Revolutionary Exterior Cleaner Concentrate 0.02 inch Pot Life at 72°F (22°C):

Pot Life at 72°F (22°C): 20 to 25 minutes

This drum can be used as a rain barrel

swelling or shrinking

And best of all

Spray & Forget - JSF2 Revolutionary Exterior Cleaner Concentrate 0.02 inch Pot Life at 72°F (22°C):The ORIGINAL NO RINSE exterior cleaner that is easy to use! This professional grade concentrate works on all types of exterior surfaces to remove green and black stains caused by algae, mold, mildew, moss, and lichen. It is a superior product that is easy to use, maintenance free, and only requires one application. JSF2 does not contain bleach, acid, lye or phosphates. Use JSF2 and eliminate the need for damaging pressure washing or laborious rinsing!