(All the suggested products are genuinely recommended based on experience. None of the products mentioned are sponsored or affiliate links.)
Supergel Stain Remover will remove the most common types of stains. Apply a small dollop directly to the affected area. If the fabric is a jersey knit like polyester, cotton or linen you can use a toothbrush to work the product in. However, avoid this step on larger/fluffier knits to prevent pilling and instead rub it in gently with your hands. Let it sit for a couple of minutes, then rinse and wash it as you would normally. Supergel has an intense scent, so to prevent it from lingering in your clothing, you can rub a drop of dish soap in with your fingers before rinsing to remove the product completely.
To refresh white fabrics or remove those stubborn orange spots that often appear on vintage clothing, use Sanytol Whitening Disinfectant Stain Remover (make sure it's the tub with the blue stripe on the bottom, as this is specific for whitening). Fill a small tub with warm water and half of a scoop of product and submerge your pieces. Leave them to soak for a few hours before washing them with the rest of your lighter pieces. If you're dealing with sweat stains or stained underarms, repeating this process a few times and consistently before washing can help significantly. This product does not contain bleach so it won't stain but be mindful that beige or off-white pieces may become noticeably whiter.
For small pen ink stains, use a paper towel lightly soaked in rubbing alcohol to blot the stain, then rinse thoroughly. Avoid rubbing, as this can push the pigment deeper into the fabric and make the stain worse.
To prevent difficult-to-remove stains such as red wine, coffee or blood, the fabric should be rinsed immediately and thoroughly with water to prevent the stain from drying in the clothing. That way, you should be able to remove it before setting into the fabric. Once set, these stains are very difficult to remove and may not come out completely using other methods.
