Toastess Coffee Maker

I couldn't find anywhere that said you can't.

I removed the perculator tubing and cleaned as much of the massive build up of hard water cake as I could. But I couldn't really get to the middle section of the u-tube. So I tried running straight CLR through it (meaning running machine through a brew cycle). It seemed to free up alot more of the junk. I rinsed 3 times with water. Coffee maker is like new again, it's a Toastess single cup Walmart special (great machine, had it for 6 years).