White powder possibly mildew

I haven't used my blender for around 2 years now (bought in 2015) but when I moved into my new apartment I decided to start making smoothies again. I cleaned all of the parts and the base and decided to do a test run with water and soap to see if it still runs good and this white dust shot out from the bottom of the blender. I assume it's mildew but I'm not sure if I should take it somewhere to get deep cleaned or try to clean it myself or just toss it and get a new one?