RWY INCURSION.

Narrative

AFTER TOUCHDOWN AND DURING ROLLOUT ON RWY 28 AT GDL ARPT; MEXICO; TWR ISSUED INSTRUCTIONS FOR CLRING THE RWY/TXWY. IT SOUNDED TO ME AND THE REST OF THE CREW THAT THEY WANTED US TO USE RWY 20. THE COPLT ACKNOWLEDGED THE CALL WITH A 'ROGER.' I EXITED RWY 28 ONTO RWY 2/20 HDG 020 DEGS. TWR CALLED US SHORTLY AFTER TELLING US TO EXIT RWY 20. WE EXITED AT TXWY A. AS WE WERE EXITING THE RWY WE SAW A SMALL ACFT ON WHAT APPEARED TO BE A MISSED APCH. THROUGHOUT APCH AND LNDG; TWR ISSUED INSTRUCTIONS IN SPANISH EXCEPT WHEN COMMUNICATING WITH US. THE ENGLISH THAT WAS SPOKEN TO US WAS VERY RAPID AND VERY BROKEN WITH A HVY SPANISH ACCENT; MAKING COMS AND SITUATIONAL AWARENESS VERY DIFFICULT. CONTRIBUTING FACTORS TO THE INCURSION WERE: 1) LANGUAGE BARRIERS. 2) WE HAD FLOWN INTO GDL ARPT FOR THE LAST 3 WKS AND EACH TIME HAD BEEN INSTRUCTED TO USE RWY 20 TO EXIT RWY 28. TO PREVENT FUTURE PROBS: 1) I WILL NOT USE A RWY AS A TURNOFF POINT WHERE LANGUAGE BARRIERS EXIST. 2) READ BACK ALL CLRNCS; EVEN DURING ROLLOUT.