Carefully follow the directions for the best results. Don't use regular firearm solvents because they will attack the seals. Use a gentle degreaser on a pure cotton patch and make sure the bore is dry before applying a very light coat of polarizing oil to protect against rust. On any airgun with greater than match velocity, use multiple Quick Clean pellets. Always sight in your airgun each time you open a new tin of pellets.
Variations can occur between batches.
Incorrect Shooting Techniques. Regular firearm dogma doesn't work on spring piston and gas spring airguns. That is why many expert firearm marksmen can't shoot airguns accurately and why many expert airgunners shoot regular firearms so well. Don't pull it in hard into your shoulder or strangle its forearm and don't rest the forearm on a hard surface. Let it recoil and vibrate freely - don't try to prevent it.