Thank you for your concern, I do know the tricks of our money exchanges and banks regarding foreign currency
They refuse to accept old bills, bills of smaller denominations or those with any kind of mark. Sometimes they offer a lower exchange rate.
the same Banks employees mark currency bills with ball point pens like it's their scratch pad, I loathe the practice & refuse to accept if I see rhem6 using ball point on some bill before handing it over to me (even if it's a PKR bill)
replacing soiled currency is a burden that is born with our tax money because even our bankers don't value it.