Glocks are easy to clean.
Just read the laundry instructions on the tag. Or, I just toss them in the washing machine and add about a 1/2 cup Tide, (no bleech needed) set it on heavy duty, warm wash/cold rinse. Then tumble dry for about 35 minutes.
Be sure it's unloaded as the washing machine could spring a leak.
You can hang them on the line to dry but they often come up missing!
What an durable machine them Glocks are.
I use BreakFree on a rag and apply wet and after a few minutes, I take a dry rag and buff it off good to get rid of the slippery grip etc. Don't know if this is recomended or not, but it works good for me.
ArmorAll is a great product and it will restore many materials but I would be very careful if using it for a firearm as it will be very slippery just as others have said. I have used it on some of my older pachmier (sp) grips and it does a great job of softening the rubber and recondidions it. I let it soak in awhile then rub it off till it's not wet then I store them away. When I get them out later on, the ArmorAll is mostly absorbed and the rubber is much softer. It does take time and be careful when you first use it. It could be too slick if not dried off well.