Product review (4 stars): Great as a pre washer for REALLY dirty welders clothing.
I bought this to reduce the amount of oil and metal particles from my sons welding work clothes. The oil and particles clogged my big washing machines filter. The Wonder Wash really does the trick. I can wash and rinse his things first then finish them with the rest of my laundry.  The rest of my laundry doesn't pick up the metal smell any more.
I would give this five stars but it drips if the lid isn't on just right and the drain  has a learning curve to it. I have it on a counter top next to a sink and keep a  rag under it to catch the drips.