To wash DTF prints, you can:
Turn inside out: Turn the garment inside out before washing to reduce friction and prevent the design from fading or cracking. 
Use cold water: Cold water is gentler on the fabric and print, and helps keep colors vibrant. Hot water can cause the print to fade and crack. 
Use mild detergent: Mild detergents are gentler on the fabric and print, and reduce the risk of damaging the ink. Strong detergents can cause the print to fade faster. 
Avoid bleach: Bleach can damage the print. 
Avoid fabric softeners: Fabric softeners can cause buildup on the print, leading to peeling and cracking. 
Use a gentle cycle: Use a delicate or gentle cycle to minimize agitation or stress on the transfer. 
Dry on low: Dry the garment on low heat.