I used the bilberry for the first time today and i have to say its the best cleaner i've ever used. The wheels were really filthy on the inside rim, so i sprayed on a 1:1 dilution and gave them a quick scrub with the megs wheel brush. When i rinsed them with the pressure washer they came up sparkling.
My wheels do need a refurb so i wasn't to worried using it 1:1, didn't damage them whatsoever!! When i do get the wheels done, i will dilute down to 1:7 and wont let them get so dirty again. Overall 10 out of 10 i'll never use anything else again