Radak: When the verse addresses the nation, sometimes it uses the singular for the Klal, and sometimes the plural for the individuals. V'Timeisem means to consider it Tamei. Chizkiyah said so about the idols that his father Achaz made. He told the Leviyim "remove the Nidah from the Kodesh"; "they removed all Tum'ah that they found in the Heichal

Rashi: It is beauty. Malbim - even though it is merely an adornment for idolatry, Tizrem

Shabbos 82a #1: This is the source that an idol has Tum'as Masa (one who moves it becomes Tamei). Just like a Davah (Nidah) has Tum'as Masa, also an idol.

Shabbos 82a #2: "TiZRem" teaches one to consider idols foreign to himself, like a Zar.

Rashi: [Idols] should be repulsive in your eyes like a Nidah.

Radak: Make it flow to a far place, like a Nidah, who dwells in a place far from her husband during the days of her Nidah ¹ .

Malbim: It should be Zar to you like a Nidah, who is Tamei mid'Oraisa.

Shabbos 82a: Do not tell it to come.

Radak #1: Tell the idol to go outside

Radak #2: "Tzei" is like Tzo'ah. Also the Mesorah says that it is ¹ an expression of filth. Malbim - it should be abhorrent to you like excrement, which is naturally repulsive.