13 Herb Bath for curse removal can be made from from any 13 uncrossing and purification herbs.
For example, if I needed to fix a batch of 13 herb bath right now based on what I've got in the house, I could mix bay leaves, rue, mint, rosemary, wood betony, sage, verbena, angelica root, white rose petals, lemongrass, lemon peel, agrimony and arnica, and it would suffice well. Other herbs like hyssop, pine needles, juniper leaves, boldo, eucalyptus leaves, mullein, basil, lavender, or marshmallow leaves would be good to use too.
By no means complete, here is a list of just a few herbs said to remove a curse or jinx that you can use to make your own 13 Herbs bath:
Agrimony
Alkanet
Angelica
Arnica
Basil
Bay leaves
Black Pepper
Blessed Thistle
Boldo
Cayenne Pepper
Chives
Eucalyptus
Garlic
Hyssop
John the Conqueror
Juniper
Lavender
Lemon
Lemongrass
Lime
Marshmallow leaves
Mint
Mullein
Onion
Pine
Rosemary
Rue
Sage
Sandalwood
Verbena
White Rose Petals
Wood Betony
Wahoo Bark
To take the bath: mix your herbs in equal parts (for one bath, a teaspoon of each is probably adequate) and boil the herbs together in water to make a strong liquid infusion. Some people like to boil the herbs for 13 minutes, but I prefer more like 30 to ensure the mixture is as potent as possible. Let the mixture cool and strain the herbs out. You are left with an herbal water which you must add to your bath.
It is traditional to take 13 herb baths daily for for 13 days in order to remove very strong curses and hexes, but you can take it only one time if you think you've merely run into a little bad energy and need a small cleansing. As always, do not add any other soaps or perfumes to a spiritual bath (take a separate shower beforehand if you need to shampoo your hair or anything of that sort.) If you don't have a bathtub you can either wash yourself out of a pan of the herb water with a washcloth, or you can use a foot soak instead of a full bath -- but you must be certain in either case to wet your head with the herbal water.
This is a very strong bath that will remedy most spiritual ailments. However, if you need stronger curse removal help, you can pair it with other curse removal spells or you can visit a professional spellcaster.