Dump files are usually located in this folder assuming Windows is installed on your C drive:
c:\windows\Minidump
There may be a file called MEMORY.DMP in this folder:
c:\windows
The Windows cleaner leaves behind lots of files that could be safely deleted.
You might consider another popular free program called CCleaner that you can download from here:
https://www.piriform.com/ccleaner/download
Most people say not to use the registry cleaner option in CCleaner.
If you don't like CCleaner, uninstall it.
I just ran the Windows disk cleanup, then ran CCleaner after and it shows another 454 MB of files that the Windows cleaner missed:
If you install CCleaner at the beginning choose to Customize the install and consider making it look like this:
You can always adjust those setting in the CCleaner options.