1, mildew category: the calligraphy and painting works are mildewed due to humidity. You can dip cotton balls directly with your fingers in alcohol and gently wipe the mildew spots until they are removed.
2, oil stains: oil stains on calligraphy and painting works, you can first put absorbent paper on the oil stains on calligraphy and painting, and then iron it several times to remove the oil stains.
3. Ink: first put a layer of absorbent paper under the dirty place, then soak the dirty place with 20% hydrogen peroxide, put some absorbent paper on the dirty place and press a heavy object. Absorbent paper is stained with ink and can be picked up. If the effect is not good once, you can repeat it many times.
4. Finger stains: When reading calligraphy and painting works, the stains on your fingers can easily stay on the paper and cloth on the back. You can dip the soft cloth in soap, gently wipe the stain, and then dry it with absorbent paper.
5. Dirty mosquitoes and flies: After the paintings and calligraphy works are stained with mosquitoes and flies, you can dip the fingerless cotton ball in vinegar or alcohol and gently wipe the stain until it is removed.