For powerheads I usually do 50/50 vinegar/water and soak overnight. Then use a toothbrush on it.

I run them for 1/2 - 1 hour in a bleach solution to dissolve (oxidize) the soft tissue, rinse and run them for another 1/2 -1 hour in a HCl solution (hydrochloric acid, also known as muriatic acid), no final rinse required(you can do it if you feel like, but you're not really doing anything). No scrubbing or disassemble involved.

I just do a quick dip in Boiled water that was poured into a pot and done slight brush .Been doing it for years and no worry about acid