PDF: Delete ICC color profile from PDF.

Deleting icc color profile from the PDF.
When to use it?
If we wish to remove color profile embedded in PDF. Thereby the size of PDF is reduced too.
What part of PDF is affected by it?
The color spaces of images, font and graphics elements change to CMYK color space.
What to watch for?
This conversion affects the entire document, therefore, it is important to check the document after conversion.
How to use it?