Here is Miko (after playing in the dirt) which becomes white after a natural drying
If you are in a hurry, you can also use a blower to dry it faster. On the other hand if your Samoyed plays in the sand, it tends to yellow the white hairs then a bath will be necessary to become white again
Regarding the frequency of brushing, we recommend that it be brushed roughly every week and have a deeper grooming once a month. If he takes a bath twice a year it will be enough and of course whenever you want him to be at his best (before an event, an exhibition, etc.)
I advise you to brush your dog on a table, or a flat surface in height to be comfortable. If you have access to a grooming table, it's even better.
Here are the tools you will need: