MY KEURIG B70 IS CONTINUALLY PROMPTING TO "PRIME"

Hi, Lauren..
You can download another manual here.

Cleaning any coffee brewer is essentially the same. The easiest way is to brew one or more pots of white vinegar... it'll stink up your kitchen, but it's effective at removing build-ups and mineral deposits. Be sure to follow up these "vinegar brews" with several "plain water brews" to remove all the vinegar!

Also, if your water reservoir isn't clean (open the lid & do a finger swipe), you can use a brush to clean it or - what I do - wad up a paper towel or two, attach it to the end of a long-handled wooden spoon, and use that to get down deep into the reservoir & scrub it as much as you can before the vinegar treatment.

Alternatively, you can spend $3 or $4 for packaged cleaning compounds at stores like Williams & Sonoma.

Good luck!

Please refer to the manual located at:

http://www.keurig.com/Customer-Service/Brewer-Registration-And-Support/~/media/Files/Keurig%20Brewer%20Manuals/B70%20UseCareGuide.ashx

If it's not explained in that manual, the full listing of manuals is locted here:

http://www.keurig.com/Customer-Service/Brewer-Registration-And-Support/User-Guides-And-Help