sorry to bring this old thread up again but ive the same problem, had a skip company ring me and said hydraulic hose burst on block paving
have been out and applied heavy duty detergents let dwell then pressure washed with whirlaway then repeated with lance
worked abit but customer still not happy, went back again and tried a few different chems then pressure washed with my truckmounted carpet cleaner, less pressure but hot|
customer says its still there so will try again next week using 1 st method
question is will this ever come out do you think?
is it wicking back up from the ground maybe?
its about a 8ft x 8ft area with a few dribbles elswhere
any ideas
stu