Here's a list of ingredients with various protective and cleansing properties that I've found useful in my closet witch practice! Note that I'm not an expert and these are just my own experiences and interpretations.
Eggshells! Great protection qualities and can also be used for renewal spells as well. A good easy spell would be sprinkling bits of it around the front of your home with the intent of providing protection
Salt, a classic cleansing ingredient that you'll find in your mom's kitchen. Various kinds have slightly different properties. Tip: if you add ashes to it, then it becomes black salt, which in my experience is very a strong cleanser especially if you add a bit of moon water. It becomes a paste and can be used for various things such as sigils
Iron nails. Not only protective, but can deflect back. Like a "back the fuck off" kind of protection. Bonus if it's rusty
Thorny vines, barbs, etc can function like nails
Pinecones. Similar to eggshells, but a bit more spicy (mess with me and I'll nip you back) but not as intense as nails. Also has great renewal properties since it's a seed
Obsidian, a great protective crystal to have on hand
Custom protection sigil, all you need is a pen, paper, and intuition. Or just write it with charged water on yourself
Moon water, especially full moon water. Very strong cleansing
Incense and smoke cleansing, I like using rose. DO NOT USE WHITE SAGE
Enchant jewelry or something you have on you on a regular basis with protective and positive energy properties. It can be as easy as making a sigil for it and activating said sigil by burning or tearing it up or dipping it in charged water. Very secretive!
Pepper! Again, similar to the nails, but with an added kick and slightly different way of carrying out things. Instead of deflecting immediately, it deflects over a slower period of time, like how burns do
Ask a deity or spirit you're working with to bless a charm. Very effective! Can be literally anything!