You could spray that Chrysler cleaner in the intake if it's similar to the old GM Top Engine Cleaner (the new stuff is junk). It's not flammable but it contains some fairly strong acids. GM always recommended changing oil after an overnight soak and Caddy had released service bulletins warning against bearing damage if contaminated engine oil was used instead of drained. Be warned, that product created a vast amount of obnoxious smoke when the engine was restarted. It's enough so a traffic cop walked into the shop one day to make sure we weren't on fire.

I usually pull the injectors and the glow plugs to introduce carbon cleaner into the prechambers directly. That also allows cleaning the tips of the injectors and the glow plugs. Then I crank the engine and blow excess chemical out. I have small adapters made from old injectors which allows me to connect hoses to blow everything below the car. Much smarter and safer than introducing a potentially flammable chemical into the intake of an engine that has no means to limit intake air supply.

If you look around, several gun owner forums have discussions about finding a replacement for some of the carbon (soot) removing cleaners that's less expensive. In some cases, review of MSDS and some trial and error leads to the old GM TEC. So now that GM TEC is discontinued I've been using Hoppe's #9 (not flammable, doesn't like to fire) in a mix with a small amount of K-100 fuel treatment (flammable, don't add too much) to aid in restarting the car afterward. It works although not as well as the old GM stuff.

I'm going to order a can of the Chrysler cleaner and see if it's the same as the old GM cleaner.

Methanol injection is also effective for removing carbon. I was going to set it up on the old Mercedes but didn't have the opportunity.

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