I get a warning that my "waste ink absorber almost full". How do I empty it?

This applies to the CANON PIXMA MP130 and other ink-jets made by Canon/Pixma.

According to the user's manual, "Ink used to clean the print head is absorbed by the waste ink tank. When this message is displayed, the waste ink tank needs to be replaced, or the machine requires maintenance". There is no information about how to replace or empty the waste ink tank.

In any case, you can try the following to clear up the error, but eventually you'll need the waste tank to be emptied or replaced. And as far as I know, you can't find the replacement parts to buy, nor the instructions to empty the waste tank.

Turn on your MP130.
1) After that press: Menu - Scan - Copy - Scan or Menu-Copy-Scan-Copy-Copy in some models, it depends on the date it was produced)
2) Select TEST MODE.
3) Enter NVRAM ACCESS
4) Select SET ABS-M LEVEL TO 0
5) Select OK
6) Keep selecting OK untill you leave the TEST MODE

Then turn it OFF and again ON. Check if the error message is still there.
The following is taken from the Canon website, regarding this specific error:

"Canon recommends having the printer serviced before the absorber becomes full. We are aware that there are many "do-it-yourself" Web sites that offer instructions for making this repair. Replacing the ink absorber is a complicated and potentially messy procedure. Even if the ink absorber is successfully changed, the ink absorber counter must be reset. Be aware that if you attempt this procedure, it is at your own risk."

As I mentioned before, I have not found any way or procedure to empty or replace the waste ink absorber nor the necesary replacement part.