Purple shampoo

Yes

My wife has natural silver hair to her waist and uses the same shampoo she has used for years. (TERESemme)

Try using a clarifying shampoo, then go back to your regular shampoo. It works wonders!

You will need to do deep conditioning treatments and protein treatments once a week, minimum.

Use a purple shampoo once a week.

same as any other color

If it's temporary dye you're going to have to wash it less often to make the dye last longer. When you do wash your hair make sure you rinse it in cold water and use a shampoo ad conditioner for colour treated hair.

If you're going to bleach your hair you should condition it after it's been bleached.

Consult with hair doctor

silver shampoo