If you usually clear cache only on the browser, you can also do it in Mobile Apps. You can clear the cache to reset previously configured settings or the username/password saved to the device. Clearing the cache might occasionally assist us in resolving minor issues that usually can happen. You can check the following steps to follow :
Step 1. Open Setting Menu on Tablet
Pick Apps, then select DealPOS.
Step 2. Choose Force Stop, then Open Storage
Step 3. Clear Cache & Clear Data, then Relaunch Apps