Used it for the first time today, on a minging garage reception that I do regular.
Did notice little brown flecks in the tub, but I have the nozzle on my sprayer set to more or less open, as it is so greasy.
Also added 5 scoops of solu boost stuff into the mix.
It's on a par if not slightly better than powerurst,the one plus is no fib and fab rinse, but not sure price wise if using the 2 products as opposed to using pwr burst and fib and fab rinse works out.
Boss was impressed.
No fun cleaning and having mechanics with greasy boots walking over the freshly cleaned carpet though