I use it all the time and just emptied a pump spray bottle of White Rain that I bought in the 80s. I have another one that my kids will inherit.
To get the grips off, slide a spoke under the grip, pull it up wards slightly and spray water or alcohol under the grip. It slides right off. I do this dozens of times per month at my local co-op. I prefer alcohol because it evaporates a little quicker.