Earning from an item one purchased with haraam money
Q: I used to make money by promoting un-Islamic cartoons. I used that money to buy a laptop. From that laptop I learned and make applications/ programs. Now I get a lot of money from the apps I made. My income now is halaal insha-Allah, but the problem is, my laptop was bought with haraam money.
What is the status of my income now? What about the knowledge I got when using the laptop? Is the money I generated, and the apps I made, all haraam? How do I repent and cleanse my profit/income?