hide prices from screen

i dont want customers seeing my prices on screen, how can i hide my prices from the customer

Your customers you mean by guests?
If by guests, you may uncheck at ACL "Public store. Display Prices" in column Guest.

yes but it takes away the add to cart button as well
i want to be able to add to chart but display no price on screen. My customers will be invoiced at a later date for the goods.
I also cant have the prices on screen as 0.00 it must be blank.
Any ideas

If you look at your store, you may see, that all prices (in case of default clean theme) are displayed via

<span class="price actual-price">...</span>

At the style.css line #1428 is rule for

 .item-box .actual-price

, add simply

display: none;

and all pricess will be hidden.

Keep in mind... Using css will make the price not visible in the main browser page, but if the customer does a View Source or Inspect on the web page, they will be able to see it.