Here are some tips:
We want your bar stools to last as long as possible, so we recommend that you tighten screws within the first two weeks after assembly. For an added safety, check the tightness of all screw every two months.
Avoid cleaning wood with water. When spills happen, clean surfaces with a slightly wet cloth and immediately dry thoroughly. For that hard to remove residue, use a small amount of mild soap. Do not use bleach.
Your stools will also stay durable when you apply wood treatment oil when it starts to wear or become dry. Avoid the use of commercial waxes or polishes, glass cleaners, or rough cleaning materials which may damage the finish.
If a spill happens to the upholstered fabric seat, spot dry with a paper towel to absorb as much liquid as possible using a regular dab. If you still see stain when it dries, pull out grandma's tricks: use soda water and salt or better yet get a suitable upholstery cleaning solution.
You can always pre-treat the seat with a fabric & upholstery protector but keep in mind that polyester is already durable and resistant to most chemicals, stretching, wrinkling, mildew, and scratches.