Sponge Linear Rail Cleaner and Greaser / lube helper.
Suggestion sponge size:30x12x10MM.Also can use nonwoven fabric.
You can print it and decide the size of the nonwoven fabric.
Bamb cleaning tool set
Bambu A1 / A1 mini Linear Rail Cleaner and Greaser / lube helper
https://makerworld.com/zh/models/109780#profileId-117277
Sponge / nonwoven fabriclube lube helper
https://makerworld.com/zh/models/110342#profileId-117940
Brush
https://makerworld.com/zh/models/112481#profileId-120452