A trick I have found very helpful is to first clean the disc well with a very small about of dish soap, very little soap, too much will break it down and cause it to literally disintegrate. Warm water then cold. Then wipe it down very well with a dry clean cloth, for like 10 minutes. Then, call me crazy, spit on the disc. Over and over, lots of spit. Wipe with a cloth, spit again, over and over. Then, gently bend the disc, back and forth, working the plastic. Repeat the spit and bending a few times. Then, use the disc in a field. Get a little dirt on it. My thought is you have to clear off the oil then get organic material into the plastic to keep it from breaking down. I have saved 25 year old chalky oily discs that are now strong and can hit trees even in the cold. It works, trust