Ask Honest John

Most recently answered cleaning questions
I was recently cleaning my car when I noticed that there was a small area (about two inches square) of discolouration in the black roof. Being unable to remove it by cleaning or polishing, I took it back...
I am about to sell the above vehicle and am having it valeted inside and out by an outfit recommended by my garage. Should I have the engine compartment, which is actually not that dirty,pressure washed...
My car is temporarily parked outside. Mould is forming on the inside of the black fabric hood - how do I safely remove this while avoiding bleach marks?
I have a Volkswagen Jetta with ‘Atlanta’ alloy wheels that are part painted and part lacquered alloy. The handbook states that car polish should not be used on the wheels but that an acid-free detergent...
About three years ago when I purchased a new BMW I agreed to dealer-applied paint protection. I have been pleased in that it seemed to take away the need for polishing, which was surprising as I am particular...
Regarding MS's email on page M7 of Telegraph Motoring about using Cif on his windscreen; I use a potato cut in half and the exposed part rubbed on the windscreen, followed by the screen washer/wipers to...
Having terrible trouble with a streaky screen, I changed the wiper blades for a second time in a month after first sourcing MER windscreen cleaner and applying as per instructions. Both were a waste of...
I recall that you gave advice some time ago regarding 'fumigating' the air conditioning and ventilation system to get rid of noxious smells. I've tried to locate this in your FAQ's and forums with only...
What is the best method of removing bird pooh from the paint work?
Nissan have advised me that they recommend a fuel system clean every six months and will carry one out automatically when they service my car, unless I request otherwise when I book the service. Is such...