Advice on Swap to Dot 5 - New MC

It would be fine if the gunk stayed in the reservoir cuz it's just taking up space,lol.
But if Dot4 is heavier and gravitates downward,into the Silicon, IDK.
In a motorcycle, front brakes at that, I wasn't taking any chances, it had to come out.
I was a pretty good mechanic; servicing all makes of motorcycles/ATVs/Sno-mobiles/ and various small-engine equipment; and got paid top wages in my field, more than some, maybe many,papered automotive dealer technicians. Brakes were particularly important to me, cuz people trust their mechanic to not let them get killed.In over 20 years, I rebuilt, reconditioned/restored/repaired/etc, a lot of brake systems, and had exactly one incident, caught before the bike left the shop. Getting the Dot4 out immediately, is too easy to take a chance.
When I say gunk; I actually don't recall what I saw, except to say it was immediately apparent that those two fluids were not friends. That was about 25 years ago, or when Dot5 first came on scene.