Fuz
While you are thinking about using the spray brake cleaners there is something you should know.
Basically there are two types of brake cleaners. First is the original types which are principally poly-chlorinated bi-phenyls. Usually they are Perchlorethylene or Trichlorethane which have the advantage of being non-flammable. The second group which are touted as being more environmentaly friendly are extremely flammable and should never be used around an ignition source such as a stove, water heater, etc. Both types should be used with good ventilation, but for different reasons. The Perc. and Tri-chlor. are exactly the same class of solvents as found in the spray cleaners sold as gun cleaners, but cost less. If you have a connection who is in an auto shop they should be able to buy this by the case for around $1 a can!
Here's another idea. When you buy a used gun which maybe hasn't been cleaned since it left the factory in 1927. These can be a real challenge. This is what I use, one of the dunk type carberetor cleaners. Solder Seal and Gunk both work well and have a parts basket in the can.
Dis-assemble the gun and place all of the parts in the basket and submerge it in the can for a few minutes. Then pull the basket out, letting the solvent drain back into the can. The final step if to wash under a hot water spray, blow dry and oil. This is the same type of product that Cylinder and Slide is selling for about $45, but the carb. cleaner costs about $15-18! You will be absolutely amazed at how easy and thoroughly this will clean even the deep recesses and sharp corners inside of revolver frames. The expensive ultra-sonic cleaners won't do any better or quicker!
Whatever you do, never put plastic parts in the carb cleaner, you'll never see them again.