I'm a huge Fiebings saddle soap fan for cleaning. I've literally cleaned hundreds of gloves with it over 20 years and it is still my favorite for cleaning most gloves. I've tried many other products that clean faster (pumice, alcohol, etc. bases), but I don't like the end results as much. I only use the other products for those pre oiled 50/60s Rawlings (like there dreaded PMM Musial 3-finger with caked-on grime). I know other friends that have also had good results with Fiebings saddle soap for years and years and others who prefer non saddle soap products.
If you clean a real dry glove with saddle soap it will sometimes leave a residue over time, as the moisture gets pulled into the glove. You can resolve this in a number of ways, but I'll typically vaseline a real dry glove before or after cleaning (usually after). I'lI rub the vaseline in well mostly with just my fingers and then use an old tootbrush for the seams, etc. Vaseline will likely darken a glove a little but in most cases closer to the original color. Never saddle soap or vaseline a glove with a suede type feel to it.
I clean so many gloves that I now but it in five pound tins, but they come in two much smaller sizes. Here's a five pounder for $38.00, shipping included for those mega-cleaners:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=380747496253&ssPageName=ADME:B:SS:US:1123