Charmed
All season 2 mistakesMistakes
1Witch Trial3
2Morality Bites8
3The Painted World3
4The Devil's Music4
5She's a Man, Baby, a Man!0
6That Old Black Magic0
7They're Everywhere0
8P3 H2O7
9Ms. Hellfire0
10Heartbreak City1
11Reckless Abandon3
12Awakened5
13Animal Pragmatism7
14Pardon My Past8
15Give Me a Sign1
16Murphy's Luck3
17How to Make a Quilt out of Americans0
18Chick Flick3
19Ex Libris5
20Astral Monkey3
21Apocalypse Not0
22Be Careful What You Witch For8
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Cole: Phoebe, I love you. I don't know what's going on but maybe I can help. Would you like me to kill someone for you?

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Answer: That was a mistake in the series.

Also, the episode is called 'Babies First Demon' and this alone tells us that it's Wyatt's first time in the field (so to speak) and as the sisters say, they've done a good job of clearing up their own magical messes so far. Nobody really knows how advanced Wyatt's powers are, or will become. That's why the cleaners appear, to nip things in the bud. The Cleaners didn't want to chance that the sisters could clean Wyatt's magic up, just incase they couldn't. Therefore intervening themselves, just in case.

Chosen answer: When the cleaners first surface in season 6 it is mentioned that usually the girls have been able to clean up their own messes (as seen in season 3 episode 22 when Phoebe turns back time thus concluding in the death of Prue).

Answer: Because they wanted them to fix their own mistakes.

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