Quoting%20commentary for Bava Batra 5:10

הַסִּיטוֹן מְקַנֵּחַ מִדּוֹתָיו אַחַת לִשְׁלֹשִׁים יוֹם, וּבַעַל הַבַּיִת אַחַת לִשְׁנֵים עָשָׂר חֹדֶשׁ. רַבָּן שִׁמְעוֹן בֶּן גַּמְלִיאֵל אוֹמֵר, חִלּוּף הַדְּבָרִים. חֶנְוָנִי מְקַנֵּחַ מִדּוֹתָיו פַּעֲמַיִם בַּשַּׁבָּת, וּמְמַחֶה מִשְׁקְלוֹתָיו פַּעַם אַחַת בַּשַּׁבָּת, וּמְקַנֵּחַ מֹאזְנַיִם עַל כָּל מִשְׁקָל וּמִשְׁקָל:

The wholesaler cleans his measures once in thirty days [because of the wine and oil that congeal in them and thus reduce the measure.], and a homeowner, [who does not sell on the scale of a wholesaler], once in twelve months. R. Shimon b. Gamliel says: Just the opposite. A shopkeeper cleans his measures twice a week [For a shopkeeper is not required to "drip" three drops as a wholesaler and a homeowner are (see 3:8), and (residue) remains in the vessel and sticks to it.], and he wipes his weights [i.e., he cleans the stones of his scales with which he measures wet things] once a week. And he cleans his scales for every weighing.

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