I always use DI water after using any sovent. I run an HPLC and use methanol as a cleaning solvent followed by degassed DI water and find no residual. You can maybe try xylene or MEK, these are some of the strongest solvents around. Most solvents don't leave residuals due to high vapor...
The 1 thing people fail to think about is that there is energy from the sun, either in the UVA or UVB range if there are clouds as well as in the infrared range. Even if it is 25 degrees farenheit there is solar energy helping melt at least the top film of water on the ice and that is all that...
