It's probably a couple of months, since I started my attempts to clean out the tank of one of my Rover 3 litre Coupes after a break of probably fifteen years. Needless to say, and I have already posted about this issue some six to eight weeks ago, so I'll refrain from repeating myself unduly. There have been three attempts by Redi Strip at Blacktown to clean the tank chemically, but I have never been able to eliminate fineish black dust particles despite many attempts using Kerosene, water...