You can use a toothbrush and hot soapy water too

as long as you rinse it and let it dry well afterwards
If you get TIM on the resistors/capacitors or whatever they are, get some isopropyl alcohol, or purpose use arcticlean, just soak the area around where you've got the compound, and use a soft paintbrush to loosen it off, and dissolve it, then mop it up with a lint free cloth easy!