Don't put it in your ultra sonic cleaner with hot water and lemishine. No longer blued. 
I am in the process of getting a stock and action ready for a new barrel showing up tomorrow. Figured I'd give the action a good cleaning. Started wiping it off with a rag and some cleaner when I had the thought to put it in the sonic cleaner. Set the timer for 6 minutes and wandered off. Came back in 4 minutes to see a bare action. Crap! Well, toss the barrel nut and recoil lug in there too.
Luckily I have a can of bake on finish. I dried it all off with some paper towel, swirled in acetone and sprayed it down. Cooking in the easy bake oven I use for drying brass and powder coating cast bullets as I type this.

I am in the process of getting a stock and action ready for a new barrel showing up tomorrow. Figured I'd give the action a good cleaning. Started wiping it off with a rag and some cleaner when I had the thought to put it in the sonic cleaner. Set the timer for 6 minutes and wandered off. Came back in 4 minutes to see a bare action. Crap! Well, toss the barrel nut and recoil lug in there too.
Luckily I have a can of bake on finish. I dried it all off with some paper towel, swirled in acetone and sprayed it down. Cooking in the easy bake oven I use for drying brass and powder coating cast bullets as I type this.