most simple, no need to use any tools
1.get some CLR
2 get 1 or 3 cc syringe
3.Use CLR full strength into steam output hole using 22 gauge needle and syringe about 3-4 cc
4. add some CLR to unit at 1:4 with water... heat.
5. wait 10 minutes and bingo
bob m
June 2018