Fom fields - Clearing inforamtion after submission

Could anyone help me with clearing information/values entered in form fields after submission? I found out that once information entered in form fields it persists forever until other information is placed. For example:

 

[Test submission 1]

* Product Name = Kitty Lunch Box

* Quantity = 2

[Contact reconversion of Test submission 1 from HubSpot]

* Product Name = Kitty Lunch Box

* Quantity = 2

 

[Test submission 2]

*Product Name = (Just leave empty)

*Quantity = (Just leave empty)

[Contact reconversion of Test submission 2 from HubSpot]

* Product Name = Kitty Lunch Box (supposed to be empty)

* Quantity = 2 (supposed to be empty)

 

Any suggestion is appreciated.

 

Thanks!

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