I'd suggest checking manga forums or dedicated Bleach fan sites. They often have detailed breakdowns and recommendations on where to pick up after a specific part. Sometimes, the author or official sources might provide cues as well.
Honestly, I don't know when the TYBW manga starts. But you could search manga databases or ask in manga enthusiast communities to get the details you need.
The TYBW arc's starting chapter isn't a straightforward answer. It could be different based on the manga version and region. I suggest looking at dedicated manga websites or asking fellow manga enthusiasts for the exact chapter.
There were many methods and products to choose from for the laundry. There were two recommended bleaches: a clothes bleacher sold by Jingdong, priced at 9.90 yuan. It was rich in sulfur and could remove stubborn stains, spots, and yellowing collars. It also had a disinfectant effect. The other one was Kao Bleach, which cost 22.50 yuan. It was a bleacher specially used to remove stains on white clothes. In addition, there were some self-made methods of rinsing, such as soaking clothes with baking soda and water, or soaking clothes with salt and baking soda after boiling. These methods could remove yellow stains and stains from clothes. The correct way to use the bleachers was to dilute the bleachers first, then soak the clothes for a while, and finally wash them with a shampoo to remove the smell of the bleachers. In short, the choice of the appropriate bleacher or method depended on the individual's needs and the type of clothing.