Not worth the money. But it on full strength,  on concrete walk let on 45 minutes, scrubbed with stiff brush left for a while and very little difference

Great for cleaning metal parts

Pretty weak does NOT perform worth a darn. I get better results from Gunk, and Mean Green

I bought this stuff to remove some Cosmoline packing grease from an old ordnance item, and in short, after three days in this stuff circulating in a parts washer with an occasional hour+ of scrubbing, ended up using some contaminated gasoline and finished the job in half an hour or so. I poured the purple power back into its jugs and I'll try it later in a power washer, but it was absolutely useless for this application.