I’m sculpting something and I started it out with separate meshes which were inside each other. They’ve been combined into one mesh but there are shapes inside of each other and I cannot figure out how to remove them. My description of the issue is horrible but I can’t put images because I’m new here.
Edit: heres a screenshot
I don’t know how to remove the stuff inside of it that isn’t visible without the x-ray thingy on.
Do you mean the two are interesecting each other and you want to select them separately?
→ The L-key lets you select connected components.
Or do they have points in common which you want to merge?
→ the M-key pops up the merge menu.
Removing in general is del key or X.
With only your description it is not easy to understand your issue. Just giving some 
or writing a comment should rank you up very fast, so that you can post pictures. 
@Tachtian ive added a screenshot and a bit more explanation
The boolean modifier is one option.
It is neccesary to start with the different parts separated into different objects. Separate them using editmode > [P] > “by loose parts” if you already merged them.
Boolean:
Start with a main part and add a boolean modfier (union) to merge a second part to it:
Apply the modifier and continue.
Remark: The boolean modifier is slow on big mehses (esp the exact one) and a little bit ficklely (water tideness, orientation of face normals, …). You may want to start small.
If it’s not important to keep the current topology, you can also remesh. With all your parts combined in the one object, add a remesh modifier.
And there is a remesh tab in the sculpt toolbar itself:
Yeah, remeshing like this or like @tomjk mentioned it, is probably the way to go.
thanks guys. ill try these when i get the chance
