sorry for the delay in reply. I never clean out sealant, and I never used to have a problem with it drying out until I moved to the desert. I am pretty slow in the uptake though so generally what happens is I feel my tire and I notice that it’s a little softer than a usual day loss of air.

I remove the core, shake my sealant and put about an ounce or more using the supplied tube (see pics). I put the core back in and pump up the tire. The entire process takes less than a minute or two for both tires.

Ive used a lot of tires and the GP5000 is certainly the longest lasting I’ve had, but as mentioned can be a little tough in mounting technique for the first timer. I’ve had great success with the Schwalbe Pro One’s (TL Easy), super easy to put on but may need a compressor to seat. Lots of great options out there!