@thekingcameron Yes, Isopropyl Alcohol will help to remove remaining residue, though I'd remove as much of it as you can using a lint-free cloth or similar before using it so you're not spreading the thermal paste or compound around and making a mess. I'd also shoot for 99% (or as close you can get), however, I've used 70% in the past and it works just as well though.
The most important thing is to make sure it's dry and that whatever you're using to remove the initial layer of paste and to clean with doesn't leave lint or debris behind. Microfiber tends to work best, though coffee filters can do the job as well. I tend to avoid q-tips as the cotton tends to string out and you don't want that sitting on the CPU/GPU, chip, or hitting the heatsink as it'll burn up quickly and may cause damage to the components.
Using 99% results in quick dry times (simply blowing on it will result in relatively quick air dry), while 70% can take a little longer, though not to any substantial degree.
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