The Surface Book isn’t easy to get apart - and neither is the keyboard base. In this case it makes sense why you’d want to use canned air. However, if you can take it apart you’ll get more done by taking the display off and directly blowing the fan off, and then clearing out the vents. The issue is canned air does NOT get to the fan well in an assembled computer, so you still need to tear the machine down anyway. The dust you missed on the fan will cause the fan to run slow, and the computer will still run hotter then if you just did it right - unless you have a system where the fan is first in the chain.
The ideal way to do it is to take the display off and clean the fans with a brush if possible. That said, it looks like the fins on the heatsink are buried in these machines with reverse-installed fans. If this is beyond you, get a can of compressed air or an airless dust blower. BEWARE: Figure out if this is "gapping" or "standard" paste if you remove the heatsink; these generally use "gapping" paste.
For the performance base (which is the only one with a fan - the IGP edition is fanless); in order to open it you need to heat up the strong tape holding it together. In addition to this, you need a pry tool that will not bend the aluminum, suction cups help. Refer to the Surface Book 2 teardown video to see how to do it. The fins are accessible once the cover is off, unlike the tablet.
I would not mess with it under warranty, but if you have no choice it’s doable - but it’s not easy.