So I recently purchased my Oakley cleaner kit, which should come in soon. But for right now I only have koala kleaner spray because my brother uses it for his Ray Bans. Is it safe to use? Because there is still smudges on it and I am a little worried. I use Flak 2.0's and I bought them in Panama City and forgot to verify the purchase because I lost the receipt a while back so yeah I'll be spending lots of money if the lens is messed up.