Dirty rims on your vehicle that are not clean. Apply Oven cleaner on it, then brush with a toothbrush.
Do you also have some trouble with the wheels of your car (or motorcycle)?
All you have to do is grab a few wet sponge and then apply dreft (without dilution).
One brush and they are gone !!
Chain oil on the rims is a hell of a job to get out there. Soak a paper towel in the turpentine and you're ready in 5 minutes.