We use just alcohol scrubs
for peripheral IV sticks. For ports, and for all central line dressing changes, we have started using chlorohexadine, though. We had previously used alcohol first, then betadine for those sites, and still use that for PICC line insertions.
The following info is from www.apic.org
(infection control association) . They say either/or.
1. Disinfect clean skin with an appropriate antiseptic before catheter insertion and during dressing changes. Although a 2% chlorhexidine-based preparation is preferred, tincture of iodine, an iodophor, or 70% alcohol can be used (73,75,207,208). Category IA
2. No recommendation can be made for the use of chlorhexidine in infants aged <2 months. Unresolved issue
3. Allow the antiseptic to remain on the insertion site and to air dry before catheter insertion. Allow povidone iodine to remain on the skin for at least 2 minutes, or longer if it is not yet dry before insertion (73,75,207,208). Category IB
4. Do not apply organic solvents (e.g., acetone and ether) to the skin before insertion of catheters or during dressing changes (209). Category IA