Try getting yourself some Valet Pro Citrus pre-wash.
Dilute around say 8-1 (check dilution rates) with warm water in a sprayer, and spray it all over the car before you do anything.
Pay particular attention to the wheel arches and the lower sills where the road grime gets.
Then leave it to soak while you get the buckets and shampoo out etc (about 10 minutes), rinse it off and then wash car as normal.
Great stuff, and you will be amazed at what it shifts.
Dilute around say 8-1 (check dilution rates) with warm water in a sprayer, and spray it all over the car before you do anything.
Pay particular attention to the wheel arches and the lower sills where the road grime gets.
Then leave it to soak while you get the buckets and shampoo out etc (about 10 minutes), rinse it off and then wash car as normal.
Great stuff, and you will be amazed at what it shifts.