Bottom grill Does the bottom grill in bottom come off for cleaning. Has water filter . Can't find how plastic white grill is removed.

https://www.youtube.com/watch?v=pnpBT1WggN4

https://www.youtube.com/watch?v=2FzqzOG9zJs

Bosch dishwashers don't have water filters per say. It may have a salt water softening system. It does have a small mesh filter in the inlet hose but if there is any kind of actual water filter inline with the system then it is external to the dishwasher.
They do have though microfine filters in sump of the unit which require cleaning regularly. This is removed by turning the plastic handle anticlockwise on the grill which is under the bottom spray arm. You turn the plastic handle to unlock the grill and lift it up revealing the filters.

Refer to the user manual for more information. If you don't have it, you should be able to download it from the BSH website.

Unplug the machine and unscrew the phillips head screw on the back grill of the machine, that is just above the plug. There are depressions on the sides of the back grill that has a plastic tang that hold the back grill to the machine. Press the back grill inwards to allow the tangs to clear the sidee and the back grill should now be easily removed. Remove the two thumb screws on the top corners to remove the filter. Once the filter is removed, then you can remove the purification plate and remove the two screws that hold the RCI cell. The RCI cell and filter can be cleaned by vacumming out the dust and dirt.

The purification plate can be cleaned with a old toothbrush and a water and amonia solution. Scrub the metal grid with the toothbrush. Do both sides and then rinse with water, allow it to dry completely before reinstalling the plate. After every part is cleaned reassemble the purifier, and plug it in. Then press the reset reminder button on the front of the keypad to clear the "perform cleaning" message. This message will appear again after the purifier runs for 30 days to remind you to clean the purifier. Hope this helps you.

Remove lowwer rrear panel. locate and remove the large black hose fastened to bottom of drum, there should be a plastic filter inside the hose, if not, then filter is located at bottom front right of washer behind cover.

its not under the grill its the big round hole on the grill

There is a connector that you need to disconnect. There is a small white ring that you push with your fingertips and at the same time pull the plastic line out. To reinstall just push the plastic tubing back into the connector. It is located behind the grille of your unit.

A picture of the part is linked just below.

Connector.

it is in the grill at the bottom of the front of your unit. you can see it when you open the freezer door.
start by removing the lower plastic grill by grabbing the grill and twisting outwards on it.
then the filter can be removed by turning the filter, top to the right.
when you put the new filter in in place, it should sound like water is running into the unit.
then replace the grill.

I usually clean condenser coils from the back by removing the lower back panel. The cover below the door is attached by clips on each end. Usually rocking the panel up and down while pulling out at the top then bottom will loosen those clips and allow for removal.

At the bottom of the dishwasher (older GE) you see a plastic cover with rounded corners and two 'grill' shaped sides. Remove the screws (1\4) and lift the cover. There might be a huge amount of grey clog and dirt stuck on the inside already. Remove it with a fork or long brush and rinse it. There is another grill in the water hole pull it out and clean it as necessary. You may also want to reach into and check the water hole for debris. If you are not comfortable doing so you can remove the water by pushing an old towel into the hole first. Once all parts are clean put them back in place and fix the cover with the screws. Pour 2-3 table spoons of bleach into the machine and let it run twice on heavy duty cycles.

The problem is likely that the cutter/chopper filter is plugged. This reduces or eliminates water flow to the cleaning arms.
Solution:
Remove dish baskets
Remove bottom arm - Rotate the centre post until arm is free to be lifted out.
Remove conduit to top arm(s) - Remove 2 screws, one at top and one at back. Rotate whole conduit 45 deg right and lift off of centre post.
Remove bottom plastic assembly. - Remove 4 screws and lift off.
Remove cutter cap. - Remove 1 screw at front left. Lift off plastic cap. Remove cutter filter. It is on a spring loaded pin. Pull cutter blade foreword and lift filter disc straight up. Clean filter disc thoroughly
Reassemble!