Get Off Those Maliciously Loaded Scripts!
Download this free Anti-Malware Plugin for WordPress.

Here is a list of caching plugins available for WordPress:

https://wordpress.org/plugins/search/cache/

All of these, by the nature of what they do, can make it difficult to remove all the malware on your site, as there purpose is to create copies of your site’s generated output (including any output generated by malware) and display that save code (even if it have malware in it).

Additionally, some of these plugin may interfere with the scan process by intercepting the generated output from the scan results, thereby potentially slowing the scan or sometimes even altering the results before they are displayed.

Therefore, it is generally advised to disable all caching and delete all cache files before scanning for malware on any site.