1)
Why did they destroy Matzvas ha'Ba'al? They burned Matzvos Beis ha'Ba'al!
1.
Malbim: Matzvos Beis ha'Ba'al were of wood, around Beis ha'Ba'al. Matzvas ha'Ba'al was a big stone altar.
2)
What are "l'Mochar'os"?
1.
Rashi: It is an expression of a privy. The same applies to "Le'echol Es Chor'eihem" (Yeshayah 36:12).
3)
Why is it written l'Mochar'os, and we pronounce it l'Motza'os?
1.
Radak: Both refer to the same thing (a place to defecate), just the pronunciation is a nicer expression.
4)
Why does it say "Asher Beis Kel"?
1.
Radak: It is as if it says b'Veis Kel. The same applies to "ha'Nimtza Beis Hashem" (Divrei ha'Yamim II, 34:30).