Purification verse 33:33

I was referred to this verse as evidence of infallible Imams: > "And stay quietly in your houses, and make not a dazzling display, like that of the former Times of Ignorance; and establish regular Prayer, and give regular Charity; and obey Allah and His Messenger. **And Allah only wishes to remove all abomination from you, ye members of the Family, and to make you pure and spotless**." 33:33 Shias conclude the above is evidence directly from the Quran supporting the idea of infallible Imams. Now for my question, where can we find the word infallible in the above verse? Infallible in Arabic is ma'soom, how is this verse related to infallibility? Clearly, even if one was to read the verse on its own, without even having to look at prior verses, one could easily conclude that it is talking about the Prophet's (pbuh) wives, hence "stay quietly in your houses", surely it is not talking about Imam Ali? And make not a dazzling display? I find it hard to believe this is in reference to Imam Ali? Or Hassan and Hussain? To top it off, there are other verses in the Quran that talks about purification, for example: > when He overwhelmed you with drowsiness [giving] security from Him and sent down upon you from the sky, **rain by which to purify you and remove from you the evil [suggestions] of Satan** and to make steadfast your hearts and plant firmly thereby your feet. (8:11) Accordingly, since the above verse is in reference to the Sahaba, does that mean the Sahaba are infallible also?