If you want to buy in store, and Halfords is your local, your best bet is the Megiuars Gold class shampoo, if you buy online, the best I've found is Dodo Juice Born to be mild (Suds very well & works brilliantly) Ive tried lots of shampoos, Autoglym, Auto finesse, Chemical guys, Megiuars... Dodo juice works perfectly & is a very good shampoo for maintenance washes weekly / fortnightly