I'm using the Switch Theme plugin

Hi,

I'm using the Switch Theme plugin (https://wordpress.org/plugins/nkthemeswitch). For instance, with these links I can see my blog in different themes:

http://liquidasites.com.br/modelo-de-site/?modelo=Fotografando

http://liquidasites.com.br/modelo-de-site/?modelo=Empresas

etc...

I use it to allow my clients see the live themes. The problem is that they see several themes and when they create their blogs by using blog template, and after they try to change the theme in their dashboard, they cannot see the changed theme due to the cookies set by the Switch Theme plugin .

What is the best solution for it? I'm thinking in clear the cookies after a blog is created. How do do it?

Thank you for your attention.