The spray, Karma Guard, has nothing to do with Hinduism. Only the term Karma is of Hindu origin.
The Web site of the product says
A few words to our Karma Guard customers about our product’s ingredients: Ginseng, used by spiritual masters over 2000 years, has many invaluable qualities, one which according to ancient text, hastens the “burning up” or cleansing of Karma. When sprayed, the purified water and Ginseng in Karma Guard will also heighten your awareness of your Karma and the effect it has on you and others.
The Chinese consider the plant Ginseng is a remedy for all diseases. It has been used by Native American people for centuries. The plant is now found largely in 
But can a spray keep the bad karma away. I definitely feel this is nothing but making use of traditional Chinese knowledge to market a product. The product cashes in on the ignorance of people.
When poor rural Indians out of ignorance perform certain rituals, the world media highlights it. You have pictures of it in major news portals. Even an incident involving a monkey is often connected with Hanuman and then to Hinduism.
But this spray is endorsed by celebrities. And no one bothers.
Well one world and two ways of viewing it.
Update - the product seems to have met its fate long back. No longer seen or heard. The official website too no longer exists.