MB3 88a: Rinsing Clothing on Shabbos (302:9 Part 1)

The Mishna Brurah introduces the melacha of מלבן ("whitening"). The minimum shiur for מלבן and washing clothing on Shabbos. Squeezing out a garment on Shabbos.

Pouring water onto a shoe vs. wiping a shoe on Shabbos.

Melaben as it applies to synthetic materials.