Commentary for Yadayim 1:4
הֵדִיחַ בָּהֶם אֶת הַכֵּלִים אוֹ שֶׁמִּחָה בָהֶם אֶת הַמִּדּוֹת, פְּסוּלִים. הֵדִיחַ בָּהֶם כֵּלִים מוּדָחִים אוֹ חֲדָשִׁים, כְּשֵׁרִים. רַבִּי יוֹסֵי פוֹסֵל בַּחֲדָשִׁים:
If one rinsed vessels in them, or if one cleaned out measuring vessels with them, they [i.e. the waters used] are invalid. If one rinsed out [already] rinsed or new vessels, they are valid [i.e. the waters are valid to be used for washing]. Rabbi Yose invalidates [the waters] regarding new ones.
Bartenura on Mishnah Yadayim
או שמיחה בהן את המדות (or he scrubbed measures in it) – the moistness that became attached to them, and they don’t leave other than with force. For this reason, it teaches the language of מיחוי/cleansing, like "מיחוי קרביו"/the cleansing of the bowels that is taught in the Mishnah of [Tractate] Pesahim, in the chapter [six – 68a]: “these things.”
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English Explanation of Mishnah Yadayim
If he cleansed vessels with the water or scrubbed measures with it, [the water] is invalid. If he used the water to clean vessels or scrub measures the water is invalid. This is because the water is considered "waste water" which shouldn't be used to ritually clean hands. Furthermore, he has used the water for work, and therefore it can't be used.
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Bartenura on Mishnah Yadayim
פוסל בחדשים – for even though they are clean, it is not customary to use them until he rinses them first. But the Halakha is not according to Rabbi Yossi.
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English Explanation of Mishnah Yadayim
If he rinsed with it vessels which had already been rinsed or new vessels, it is valid. Rabbi Yose declares [the water] invalid if they were new vessels. If the vessels didn't need to be washed or scrubbed because they were either clean or new, then the water remains valid because it didn't need to be used. Rabbi Yose says that if the water was used to wash new vessels it is still disqualified since it is customary to wash off new vessels. In other words, something that is customary to do is considered work, even if it is isn't strictly speaking necessary.
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