Use the 16oz can of Berrymans. Thats the stuff with the little spray tube nozzle attachment on the side of the can.
I pulled my UIM/LIm to clean them but from what BIg Jim has said the spray can works very well while the car is running.

06 GMC Sierra 2500HD Dmax/ally 06 Pontiac G6 GT 05 CRF250R FOR SALE 06 KX65 with riding gear $2700 obo