Sadly the DPM price seems to have crept up a little, I guess the suppliers are reacting to the shortage of IPA for the print industry, it now seems to be around £40 for 5L.
Our own feelings are that its the best alternative to IPA, but might need a slight tweak in your workflow to get the best out of it.
Our workflow is 5min in ultrasound bath at 30c, then into Formwash for 3 minutes for a quick rinse that is using 10ml washing up liquid to each litre of water, (yes thats right, we use the Formwash to quickly remove any residual DPM, as the water left after the Formwash dries much quicker than DPM)
As a result we have at least halved our clean up time of prints compared to simply using IPA, the surface finish is better and the DPM lasts several times longer than IPA.
In our experience DPM is more easily available than TPM, its also cheaper. Using the ultrasound is very efficient and the water detergent mix in the Formwash will not attack the Formwash powder coating (DPM is a very efficient solvent and eventually removes powder coating - TPM does not)
This is the ultrasound that we use on a day to day basis (We also have a larger one (10L) that is used for the largest prints)
