I have SG on my wheels. I completely water down my wheels first then give one or two squirts of EF HI per wheel. A sponge and/or foam bottle brush picks up enough EF HI to clean well but doesn't hurt the SG very much. I probably end up using even less than a 50-50 proportion of EF and H2O.
I re-do SG on the wheels 2-3 times a year max.