You can’t remove them
You can’t simply remove items from your credit report. Old accounts are part of your credit history, and count in your FICO score.
With time, information does fall off your credit report. Most negative items remain on your credit report for 7 years, while closed accounts in good standing remain on your credit report for at least 10 years. They just don’t count as much in your FICO score as open, active accounts.
Closed accounts in good standing are positive history and improve your credit score. Removing them would adversely impact your credit.
More about closed accounts here. See this for a complete list of the credit report time frame limits.