There are some caveats:
- Neither water nor club soda will completely remove the stains. An analysis under ultra violet light showed that at least a portion of every stain remained after the club soda or water was used.
- If left untreated, the remaining stain residues can become permanent stains over time.
- The sugar residue from the club soda in the beginning is unseen but it can caramelize during the drying process and leave a yellowish stain.
- When it comes time to remove the stain, the chances are greatly increased if club soda or water is used to rinse the stain before it dries.
- If you happen to try using club soda on a stain, then take it to a professional cleaner as soon as possible after doing so. Be sure to point out both the original stain and the club soda when dropping off the garment. If this is not done as soon as possible, the invisible residue can oxidize over time and leave permanent discoloration which on some fabrics cannot be removed.
- There are also some stains that club soda makes worse. If water or club soda is used to remove a water and solvent combination stain, like ballpoint ink, it can actually set the stain permanently.