emacs lisp: How to remove/delete an element of a list?

I tried my first steps with emacs lisp to remove the element "\\.synctex\\.gz" from LaTeX-clean-intermediate-suffixes:

(eval-after-load 'latex
  '(setq my-LaTeX-clean-intermediate-suffixes (remove '"\\.synctex\\.gz" LaTeX-clean-intermediate-suffixes)); that's not working
  '(setq LaTeX-clean-intermediate-suffixes
     (append my-LaTeX-clean-intermediate-suffixes (list "-blx\\.bib" "\\.run\\.xml"))))

How can I remove this element here? I found remove and delete, tried them both, but I get an wrong-number-of-arguments-type of error.

Update

I tried this:

(eval-after-load 'latex
  (setq LaTeX-clean-intermediate-suffixes (delete "\\.synctex\\.gz"  LaTeX-clean-intermediate-suffixes))
  '(setq LaTeX-clean-intermediate-suffixes
     (append LaTeX-clean-intermediate-suffixes (list "-blx\\.bib" "\\.run\\.xml"))))

but I receive quite a long output in Backtrace :-(