30 Seconds Outdoor Cleaner 1000 Sq. Ft. Concentrate 5 Gal

When I first used this product, I was amazed at how well it worked. Dirt and algae that had resisted a power washer just melted away. It did take a few gallons to clean my dirty 2-story house and part of a *very* dirty camper, but it was worth it. However, after my first batch ran out, I purchased a larger quantity to finish my camper, but that didn't seem to work so well. Some algae didn't come off even after repeated soaks. At first, I thought this might be because the work space was different, but I noticed this again on another house. It still worked, but seemed weaker. I was hesitant to write this as it is possible that I am mistaken. I may purchase some in the smaller jugs to compare more properly, but it will take a while for my house to need another cleaning.