I use a polish cleaner I get from Cue stock and a small old washcloth. USually helps to try to use a tip that is as close to the size that you need. The excess glue should be cleaned from the ferrule. I will clean the excess glue that squeezes out when I press the tip on before it starts to set. you don't want to have to use sandpaper to clean it off after it dries. That's bad form. I don't like to cut to much sidewall off the tip. Can make the tip break down easier I think, especially LE Pros. I use a razor blad to cut the exces tip edge off, people cringe when they watch me hold a razor blade right up on it's side behind the bottom of the tip edge where it meets the ferrule. I've have never had a blade slip. I cut the edge very cleanly as the shaft is turning, at about 800 rpm or so. faster makes for a cleaner cut on the leather for me, and a nice sharp blade is a must. if you do this correctly, and cut cleanly, the leather will be easier to burnish. I Then touch up the sides of the tip with some 320-400 sand paper and then put a little polish on the tip side and use my rag to and 2 hands to work the polish in. I will get the edges a little hot, it's a feel I have through the rag. I think the clean cut helps make for a nice sidewall that won't break down as easy or mushroom as much. MUST watch the heat though on many ferrule materials. Predators will melt pretty easy as will Meucci. Both use a softer plastic for ferrule material. Best to keep the heat only on the tip sides. A smooth surface on the tip edge is imperative for a good burnish, in my opinion. I also don't like to leave all tip on there. for my personal cues I will take as much as 50% off right from the start because I like the way the tip plays at that level. To much tip will probably need to have the mushroom taken off after a few days of shooting with it. especially if you break with the same cue. This was a lengthy explanation for a simple thing but I believe that the burnish is just a final touch on a complete process, As in all aspects of cue making every step is important for complete, finished piece. Just my 2 cents. Good old water will work in the same way, I ust like the polish.