I don't have a Glock, it's all H&K here. Fortunately, I usually don't have to clean my own guns either since one of the guys I often go shooting with actually LIKES to clean guns; it's his hobby. Truth be told, the only reason he goes shooting is to dirty up the guns so that he can have the joy of cleaning them.
So, after the ammo is all spent, the conversation goes like this:
"Say... are you gonna clean that gun?"
"Yes, that is the next step."
"Ah.... gee.... could I... well... maybe.... would you let me clean it for you?"
"Oh, I don't know... cleaning is the best part. You're asking for alot."
"I know. I'm sorry. It's just that if you'd let me clean your gun, I'd be eternally grateful to you."
"Well, since you're such a good friend, I guess I could let you have the pleasure of cleaning my gun."
"Oh, thank you thank you thank you. You are the best friend a guy could have!"